That could result in some...interesting...ads. I:
I'm really not sure why they show me ads for rehab places, though? I don't remember googling or using websites pertaining to that. Well, aside from looking something up that was irrelevant to drugs and ending up with a mass amount of pictures of weed :?

Yeah. It'll try finding relevant topics to what you search. For some reason though, a little while back, some users were complaining that they were seeing similar ads on "Gay Interracial Dating". So I think it's a bit of both.